MyocardiumMyocardial ContractionHeartCardiotonic AgentsHeart VentriclesCardiomyopathy, DilatedHeart FailurePapillary MusclesVentricular Function, LeftMyocytes, CardiacDogsThiadiazinesIsoproterenolCalciumMyocardial IschemiaCoronary CirculationHemodynamicsAdrenergic beta-AgonistsMyocardial StunningPyridazinesSarcoplasmic ReticulumDepression, ChemicalCardiomyopathiesThiamylalHeart AtriaIschemic Preconditioning, MyocardialStimulation, ChemicalDobutamineVentricular FunctionMyocardial Reperfusion InjuryCardiac OutputHeart RateEchocardiographyCardiac Output, LowAdrenergic beta-AntagonistsDose-Response Relationship, DrugHydrazonesVentricular PressureAmrinoneMyocardial InfarctionHalothaneBlood PressureVentricular Dysfunction, LeftCalcium-Transporting ATPasesStroke VolumeTime FactorsSystoleSodium-Calcium ExchangerIsofluraneMyofibrilsSarcolemmaPropanolaminesHeart Function TestsPerfusionSarcoplasmic Reticulum Calcium-Transporting ATPasesCardiomegalyInfusions, IntralesionalAnestheticsPropranololEnzyme InhibitorsCardiac VolumeTroponin IVascular ResistanceMethyl EthersSarcomeresReceptors, Adrenergic, betaAutonomic Nerve BlockCreatine KinaseDiastolePenbutololCells, CulturedAnalysis of VarianceRats, WistarRats, Sprague-DawleyModels, CardiovascularEnfluraneHeart TransplantationCoronary VesselsEthersSwineOuabainMitochondria, HeartMuscle ContractionCalcium-Binding ProteinsDisease Models, AnimalNitric Oxide SynthaseRabbitsUterine ContractionNitric OxideElectrocardiographyCardiovascular SystemCardiac Pacing, ArtificialCardiac CatheterizationNorepinephrinePropofolNitric Oxide Synthase Type IReference ValuesRNA, MessengerOxygen ConsumptionHypotension